Production of Single W Bosons at LEP and Measurement of $WW\gamma$ Gauge Coupling Parameters

\documentclass[12pt,a4paper,dvips]{article} \begin{document} \begin{center} {Production of Single W Bosons at LEP and \\ Measurement of \boldmath$\rm W W \gamma$ Gauge Coupling Parameters} \end{center} \begin{abstract} Single W boson production in electron-positron collisions is studied with the L3 detector at centre-of-mass energies between $192\mathrm{\ Ge\kern -0.1em V}$ and $209\mathrm{\ Ge\kern -0.1em V}$. Events with two acoplanar hadronic jets or a single energetic lepton are selected, and the single W cross section is measured. Combining the results with measurements at lower centre-of-mass energies, the ratio of the measured cross section to the Standard Model expectation is found to be $1.12^{+0.11}_{-0.10}\pm0.03$. From all single W data, the WW$\gamma$ gauge coupling parameter $\kappa_\gamma$ is measured to be $1.116^{+0.082}_{-0.086}\pm0.068$. \end{abstract} \end{document}